SPERM TEST is an in-vitro device for qualitative determination of sperm concentration in human sperm samples, as an aid to clinical diagnosis of infertility and/or an aid to planning a pregnancy. The test uses a membrane made up of inert glass fibers characterized by a high-water absorption capacity and pores for sperm filtration. The spermatozoa are trapped by the first layer of the membrane and the dye solution colors them: the darker the color in the well, the higher the concentration of spermatozoa in the sample.